Thermo Pride MODEL OPA - Manual (Page 15)

All installations and services must be performed by qualified service personnel.
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In addition, long term exposure of building materials to combustion products may
cause discoloration of material surfaces and corrosion or degradation of
materials. The preferred installation location will allow combustion products to
freely escape the immediate area of the appliance and rapidly disperse into the
atmosphere, without being drawn back into the appliance or a nearby structure.
To prevent combustion products from entering a structure, the vent terminal must
expel combustion products away from any point of entry. The minimum
acceptable distances from the vent terminal to points of entry to a building are 4
feet horizontally from, and 1 foot above, or at least 4 feet below, any window,
door, or gravity air inlet into the building. And, 3 feet or more above any forced
air inlet to the building located within 10 feet of the terminal.
Once the unit is installed in a suitable location, the installer must mount the vent
terminal to the appliance. Two sheet metal screws are installed in the unit for this
purpose. Refer to Figure 2 for a sketch of the correctly assembled vent terminal.
FIGURE 2: Vent Terminal Mounting Position
D. Condensate Drain
This appliance is equipped with a ¾ inch, female, NPT coupling for connection of
a condensate line to the evaporator drain pan. A condensate removal line should
be fabricated and attached to the coupling, refer to Figure 3. The condensate
drain line must be pitched downward to drain properly. The drain line can also be
trapped and the condensate pumped to a suitable drain. If the drain line clogs,
when the air conditioner is operating, the condensate tray under the evaporator
coil will fill with water. As a result, water may enter the appliance housing and
the supply air ductwork to the structure.